Simple:
* The grumpy old man glowered at the children playing in his yard.
* She glowered at him, her eyes narrowed in anger.
With context:
* The teacher glowered at the students who were talking during the test.
* The politician glowered at his opponent during the debate, refusing to answer the question.
* He glowered at the pile of dirty dishes, wishing he had a dishwasher.
Figurative:
* The storm clouds glowered menacingly over the horizon.
* The abandoned house seemed to glower at the passerby, its empty windows like vacant eyes.
Using synonyms:
* The stern librarian glowered at the noisy children. (Instead of "glowered" you could use "stared" or "frowned.")
* The angry customer glowered at the cashier. (Instead of "glowered" you could use "scowled" or " glared.")
The key to using "glowered" effectively is to convey a sense of displeasure, anger, or disapproval.